The CJMCU164 8-bit shift register board is based on the SN74HC164D IC. The SN74HC164D is an 8-bit serial-in parallel-out shift register.

SN74HC164D

These 8-bit shift registers feature AND-gated serial inputs and an asynchronous clear (CLR) input. The gated serial (A and B) inputs permit complete control over incoming data; a low level at either input inhibits the entry of new data and resets the first flip-flop to the low level at the next clock (CLK) pulse. A high-level input enables the other input, which then determines the state of the first flip-flop. Data at the serial inputs can be changed while CLK is high or low, provided the minimum setup time requirements are met. Clocking occurs on the low-to-high transition of CLK.

Technical data

• Supply voltage range, Vcc: –0.5 V .. 7 V
• Input clamp current, IiK (Vi < 0 or Vi > Vcc): ±20 mA
• Output clamp current, IoK (Vo < 0 or Vo > Vcc): ±20 mA
• Continuous output current, Io (VO = 0 to Vcc): ±25 mA
• Continuous current through Vcc or GND: ±50 mA

https://docs.arduino.cc/tutorials/communication/guide-to-shift-out/

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